Mortgages, notes payable and credit line (Schedule of Principal Amounts Due) (Details) $ in Thousands	Oct. 31, 2015 USD ($)
Mortgages, notes payable and credit line [Abstract]
2016	$ 28,365
2017	25,507
2018	8,795
2019	140,613	[1]
2020	$ 22,062

[1] Includes $92 million relating to the Rotunda construction loan, due December 2018. (See Note 5(M).)